umm baking soda definitely leaves a white caked substance on the scalp and i've brought it up before but i was sick of people acting like i was nuts so i stopped bringing it up.
its better to alternate with quality non-residue shampoos.
stay away from more than 1 or 2 drops of each oils per wash. it's counter productive and they build up especially if you use baking soda.
I totally agree with Chewin...see it a bit too much with the BS being described as the holy grail or something, when in fact it seems to leave a "nice" layer of white mud on your scalp.
That might come from me doing it wrong though....maybe BS ONLY works with cold water + ACV rinse afterwards or something? Then that should be clearly mentioned each time BS is mentioned :P
Personally I don't think I had dandruff but it was buildup of some sort. A muddy buildup that just smelled funky. I think if people use baking soda they should use minimal amounts of it (diluted) because there HAS to be some sort of "grains" if you will that stay behind. Have you ever let a little bit of the solution dry in a container? When it dries, it dries in tons of little granules but also a few bigger granules, which makes me wonder.